The first time i tried playing the game i got the "Loading" locked screen thing. closed it and retried and it worked.
been playing the game for three day's now and had that loading screen thing once yesterday, and for the past hour today i have been having it.
just got back into the game. since i had a few google tabs open, i just closed most of them, even though resource manager showed that i had plenty of resources available. oh, and i tried normal and as administrator during that hour.
My guess is that initially the game required a lot of resources to get past that loading screen, much more than needing to be ran as administrator, though that should help. i am not currently running as administrator.
If the Avus splash screen does not show up right away then my guess is that something timed out and you get stuck at the loading screen.